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This is part of PR36515.
With some linkerscripts it is possible to get file offset overlaps
and overflows. Currently LLD checks overlaps in checkNoOverlappingSections().
And also we allow broken output with --no-inhibit-exec.
Problem is that sometimes final offset of sections is completely broken
and we calculate output file size wrong and might crash.
Patch implements check to verify that there is no output section
which offset exceeds file size.
Differential revision: https://reviews.llvm.org/D43819
llvm-svn: 327376
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